| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and a system that extract a specified sound by estimating the direction of a sound source in an environment wherein a plurality of sounds are generated. SOLUTION: The system has a reception unit 101 which collect sound signals generated by the plurality of sound sources by both right and left reception parts between two different points (between 2 channels), a transformation unit 102 which inputs an inter-2ch signal from the reception unit 101 and divides the signal by logarithmic frequency bands of an octave structure (divides the inter-2ch signal by complex wavelet scales through complex wavelet transformation), an estimation unit 103 which calculates difference data (a difference in argument and a difference in level of a complex wavelet coefficient) between the 2 channels by the logarithmic frequency bands and estimates directions of the sound sources by using DOA estimation based upon the difference data, a separation unit 104 which emphasizes a sound in a specified sound source direction obtained through the DOA estimation, and a database 105 in which measurement data needed for the DOA estimation are previously recorded. Estimation precision of the sound source direction can be improved and a target sound source can be extracted. COPYRIGHT: (C)2007,JPO&INPIT
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